The singer also competed on American Idol's ninth season, but never made it to the finals. She seems to be doing pretty well, regardless — her video has accrued almost a million views in a few days, proving that Kelly is probably headed for stardom.

14 Most Entertaining YouTube Cover Songs

"Somebody That I Used to Know" (Gotye Cover) by Walk off the Earth

Take five indie performers from Ontario, then combine with one smash hit that the radio stations just won't stop playing, and you get Walk off the Earth's (WOTE) cover of Gotye's "Somebody That I Used to Know."

WOTE performed the entire song with five people using one guitar, an incredibly creative performance that scored them a ton of views, a spot on the Ellen DeGeneres Show and even praise from the original artist himself.

"Viva La Vida" (Coldplay Cover) by Aston

While you might not have been gripping the edge of your seat, dying to hear a Coldplay cover, the Australian group Aston manages to breathe fascinating new life into the song. Using classical techniques and a surprisingly classy sound, this version of "Viva La Vida" is actually a lot of fun.

"We Found Love" (Rihanna Cover) by Lindsey Stirling

Violinist Lindsey Stirling went to Kenya to cover Rihanna's "We Found Love." Most of the people she encountered had never heard or even seen a violin before her performance. After returning to the United States, Stirling said, "We couldn't understand each other's language but that is why it was so powerful. Two completely different cultures were able to connect as we shared our form of music..."

"Home" (Cover) by "I am a Star" Top 14

Fourteen performers created this video for Scot Alan in thanks for his "I am a star" contest, an American Idol competition for YouTube singers. Whether you're familiar with the song or not, the performance is powerful and moving. You don't often get to hear vocals like this, let alone on YouTube.

"What Makes You Beautiful" (One Direction Cover) by ThePianoGuys

Whether or not you're a fan of One Direction's original song, this team brings a whole new zeal to the performance by putting the whole team around a single piano to create all the sound effects. That's the way you make an otherwise standard song absolutely enthralling.

"Hallelujah" (Leonard Cohen Cover) by Karise Eden

Karise Eden covered Leonard Cohen's "Hallelujah" for The Voice Australia. It seems like every singer needs to cover this song some time in their career, which is why it's a pleasure to hear Eden bring so much emotion and strength to the song.

"Cello Wars" (Star Wars Parody) Lightsaber Duel by ThePianoGuys

In another gem from ThePianoGuys, Steven Sharp Nelson has a cello duel with himself in this Star Wars parody. With an accordion-toting Darth Vader, there's a lot to love about this video. If you're so inclined, "Cello Wars" is available on iTunes.

"Wonderwall" (Oasis Cover) by Jake Coco

You couldn't step into a coffee shop or mall anytime during the late '90s without hearing "Wonderwall," making it one heck of a song to cover. Jake Coco pulls it off by somehow adding more moodiness and emotion to the tune, no mean feat by any standard. If you want a soundtrack while you're crying into your java, this should definitely be your go-to cover.

"Sexy and I Know It" (LMFAO Cover) by Noah

When you first see 18-year-old Noah in this video, you could not possibly predict the voice coming from this guy. But as soon as he picks up his rendition of "Sexy and I Know It" by LMFAO, you'll be hooked. That voice landed him a guest spot on NBC's Today Show for very good reason. And yes, he covers "Somebody That I Used To Know," just like everybody else.

"Just A Dream" (Nelly Cover) by Sam Tsui and Christina Grimmie

Sam Tsui is a bit of YouTube legend. He teamed up with Christina Grimmie to cover Nelly's "Just a Dream." With mind-blowing vocals, Tsui and Grimmie create one of the most impressive performance covers you will see on YouTube. The astounding part isn't a technical trick or clever method; it's just the raw beauty of their voices.

"Beat It" (Michael Jackson Cover) by Igor Presnyakov

Igor Presnyakov presents something a little different by covering Michael Jackson's classic "Beat It" on acoustic guitar. It's a skillful cover that reinterprets Jackon's original, which is a refreshing change from just "new people singing the same song."

We watched this video, and then we watched it again to understand what we had just seen. Amy of Karmin rips through the raps in "Look at Me Now" by Chris Brown with Lil Wayne and Busta Rhymes. Nick works the keyboard, and you really just need to see the video to believe it.

"The Lazy Song" (Bruno Mars Cover) by Megan Nicole

Bruno Mars's "The Lazy Song" was already a little crazy, so how do you up the ante on that? Megan Nicole did it by putting her dancers in simian masks and pajamas. It's a little nuts, but that's what you get with "The Lazy Song."

"I'm Yours" (Jason Mraz Cover) by Unknown Amazing Kid

We close up this round-up of incredible covers with this little guy tackling Jason Mraz's "I'm Yours" on his ukelele. It's a classic video at this point, having first made its rounds in 2009, but it still holds a special place in our hearts. We think you'll agree it's adorable. (He's also mastered "While My Guitar Gently Weeps," if you need just a little more.)

Mashable
is a global, multi-platform media and entertainment company. Powered by its own proprietary technology, Mashable is the go-to source for tech, digital culture and entertainment content for its dedicated and influential audience around the globe.